I would be interested in that as well. I found that I still can play videos from the File Explorer to the TV. I even could play Videos out of the new Videos app. But I couldn't find how to stream videos out of IE11 or Edge.

It doesn't have anything to do with Edge. "Connect" in Windows 10 is a system level connection which only supports Miracast/WiDi and Bluetooth receivers, not DLNA receivers. In Windows 8.1 "Play to" supported DLNA receivers, which is what your Xbox is. That's why you can't find any devices when using "Connect" in Windows 10, you don't have any Miracast certified receivers. Not that you want such a receiver, it's an abomination of a protocol compared to DLNA. With Miracast you have to mirror/extend your screen when showing content from Edge (or any other modern app for that matter) on the big screen, with DLNA you could just "send" whatever content you'd like to show to the TV. I am really angry at Microsoft for taking away this feature, why do I have to mirror/extend my screen just to show a picture from Edge?